Combined Blood Bank Refrigerator and Plasma Freezer

What is the Combined Blood Bank Refrigerator and Plasma Freezer?

A dual-compartment cabinet giving 2–6 °C for red cells and –30 °C or colder for plasma in one unit with separate circuits and alarms. It fits small hospital transfusion services that handle both components and lack space for two full-size cabinets.

Overview

The dual cabinet stacks or places side by side a refrigerated section for red cell concentrates and a freezer section for fresh frozen plasma, which is commonly stored at –25 °C or colder and at –30 °C or colder for longer shelf life. Each section has its own compressor or evaporator, controller, recorder, independent alarm probe and door, so a fault in one does not affect the other. Total volume is typically 300–700 L, often 60 to 70 percent refrigerated. The freezer uses high-efficiency insulation and a heated door frame, and air circulation limits frost. Users must still keep separate temperature records for each section. The format is convenient, but capacity is small compared with separate dedicated cabinets.

How does it work?

A laboratory blood bank refrigerator uses a vapour-compression circuit with forced-air circulation to hold a narrow temperature band. The cabinet has PU insulation, ducted shelves and a microprocessor controller that reads a control probe and cycles the compressor. A second, independent probe, often buffered in glycol, drives a separate alarm circuit with battery backup so that a control failure cannot go unnoticed. A chart recorder or electronic logger produces a continuous record. Air ducting and fan placement minimise cold spots near the evaporator to avoid freezing red cells and haemolysis. Units for samples and reagents can use a simpler undercounter design, while those for transfusion units need tighter uniformity, recording and validated alarm performance.

What are the key features?

• Separate red cell and plasma compartments with independent circuits
• Plasma section reaches –30 °C or colder
• Independent recorders and alarm probes for each section
• Heated door frame and high-efficiency insulation in the freezer section
• Saves floor space in small transfusion services

What are the technical specifications?

A typical combined blood bank refrigerator and plasma freezer configuration offers refrigerator temperature of 2–6 °C, freezer temperature of –30 °C or colder, total net volume of 300–700 L, volume split of About 60–70% refrigerated, temperature uniformity of ≤ 2 K refrigerator, ≤ 5 K freezer and recorders of One per compartment, chart or electronic. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Combined Blood Bank Refrigerator and Plasma Freezer is used in small hospital transfusion services, plasma and red cell storage, satellite blood storage and blood collection sites. Across the wider Blood Bank Refrigerators class, laboratories also deploy it for retained patient samples, red cell storage and transfusion reagents.

Which standards and certifications apply?

Relevant standards and methods include AABB Standards for Blood Banks and Transfusion Services, Council of Europe Guide to the Preparation, Use and Quality Assurance of Blood Components, ISO 15189, IEC 61010-2-011 and IEC 61010-1. Certification candidates for this model are CE, ISO 9001 manufacturing and ISO 13485 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install on a level floor with the clearance stated in the manual, away from heat sources, and allow the cabinet to stabilise before loading. Perform installation, operational and performance qualification, including temperature mapping and alarm challenge tests, and repeat after relocation or major repair. Calibrate probes and recorders at least yearly against traceable references. Clean condensers, check gaskets and test battery backups on schedule. Keep records of temperatures, alarms and corrective actions as required by your accreditation body and transfusion regulator.

How do I select the right Combined Blood Bank Refrigerator and Plasma Freezer?

Choose the combined cabinet when red cell and plasma volumes are both small and space is tight. Specify each section's volume and temperature, recorders, alarm probes and door configuration. Use separate dedicated cabinets where plasma stock is large, where thawing equipment is nearby or where full redundancy is required.

How does it compare with other Blood Bank Refrigerators variants?

Decide first what will be stored. Samples and reagents suit 2–8 °C undercounter or benchtop units, red cell units need 2–6 °C upright cabinets with chart recorder and independent alarm, and plasma needs a freezer or a combined cabinet. Compare temperature uniformity (2 K or better for units), recording method, battery duration and alarm contacts. If several cabinets are operated, choose remote monitoring with audit trail. Match capacity to peak stock and allow for growth. Check that the ambient range and power supply suit your laboratory, and ask for mapping data from the manufacturer.